Worshipping Phra Rahu with only black colour foods, a list of 8 kinds of black foods and the meanings:
1. Black grapes means good business.
2. Black liqueur means courage to risk or invest.
3. Black coffee means you will get whatever you wish for.
4. Black jelly or Shoa Guay means patience and graceful thought.
5. Black beans mean progress.
6. Black sticky rice means wealth and love form family.
7. Black Thai cake means rewards, success and good luck.
8. Black fermented eggs mean successful contact or errands.